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【多选题】
我国促进对外贸易发展采取的措施有（）A.
出口信用保险
B.
出口信贷
C.
出口退税
D.
设立外贸发展基金
E.
出口免检
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反馈参考答案：
举一反三
【单选题】The passage is mainly concerned with ______.
A.
the feasibility of life existing on other planets
B.
the description of Mars's physical environment
C.
the comparison between the physical features of Mars and the Earth
D.
the feasibility of men's migrating onto Mars
【单选题】Which is not the chemical component of microtubule?
A.
a-tubulin
B.
β-tubulin
C.
histone
D.
microtubule associated proteins(MAP)
【判断题】Other microtubule plus-end tracking proteins may use EB1 to “hitchhike” onto the growing microtubule.
A.
正确
B.
错误
【简答题】微管组织中心(microtubule organizing center)
【单选题】Which description about microtubule and MTOC is false?
A.
MTOC is the specialized organizing center for microtubule growing
B.
The best studied MTOC is the centrosome in plant cells.
C.
The γ-tubulin ring of MTOC serves as the starting point or nucleation site for the growth of one microtubule.
D.
The plus end of each microtubule face outward where further growth can occur.
【简答题】微管(microtubule)
【单选题】About the assembling of microtubule, which is correct?
A.
dimer→protofilament→α、βtubulin→microtubule
B.
α、βtubulin → dimer → protofilament → 13 protofilament →microtubule
C.
α、βtubulin → 13 protofilament →microtubule
D.
α、βtubulin → dimer → protofilament →microtubule
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